diff --git a/test/errors.test.js b/test/errors.test.js
index 989dad6..9d519f5 100644
--- a/test/errors.test.js
+++ b/test/errors.test.js
@@ -426,8 +426,8 @@ test('should handle an error in the handler in res stream app', async t => {
   t.truthy(errMsg1)
   t.truthy(errMsg2)
   t.true(endCalled)
-  t.true(errMsg1.indexOf('Unexpected token') >= 0)
-  t.true(errMsg2.indexOf('Unexpected token') >= 0)
+  t.true(/Unexpected.+JSON at position/.test(errMsg1))
+  t.true(/Unexpected.+JSON at position/.test(errMsg2))
   t.truthy(errCtx)
   t.truthy(errCtx.call)
   t.truthy(errCtx.req)
@@ -523,8 +523,8 @@ test('should handle an error in the handler in req stream app', async t => {
 
   t.truthy(error)
   t.truthy(error.message)
-  t.true(errMsg1.indexOf('Unexpected token') >= 0)
-  t.true(error.message.indexOf('Unexpected token') >= 0)
+  t.true(/Unexpected.+JSON at position/.test(errMsg1))
+  t.true(/Unexpected.+JSON at position/.test(error.message))
   t.truthy(errCtx)
   t.truthy(errCtx.call)
   t.truthy(errCtx.req)
@@ -680,8 +680,8 @@ test('should handle an error in the handler of duplex call', async t => {
   t.truthy(errMsg1)
   t.truthy(errMsg2)
   t.true(endCalled)
-  t.true(errMsg1.indexOf('Unexpected token') >= 0)
-  t.true(errMsg2.indexOf('Unexpected token') >= 0)
+  t.true(/Unexpected.+JSON at position/.test(errMsg1))
+  t.true(/Unexpected.+JSON at position/.test(errMsg2))
   t.truthy(errCtx)
   t.truthy(errCtx.call)
   t.truthy(errCtx.req)
@@ -772,8 +772,8 @@ test('should handle an error in the handler of duplex call that returns a promis
   t.truthy(errMsg1)
   t.truthy(errMsg2)
   t.true(endCalled)
-  t.true(errMsg1.indexOf('Unexpected token') >= 0)
-  t.true(errMsg2.indexOf('Unexpected token') >= 0)
+  t.true(/Unexpected.+JSON at position/.test(errMsg1))
+  t.true(/Unexpected.+JSON at position/.test(errMsg2))
   t.truthy(errCtx)
   t.truthy(errCtx.call)
   t.truthy(errCtx.req)